Brush-holder.



D. B. FLOWER.

BRUSH HOLDER.

APPLICATION FILED JUNE 2,19%

Patented Mar. 20, 1917.

25 4 mmt DAVID B. FLOWER, GLENSIDE, PENNSYLVANIA.

BRUSH-HOLDER.

Specification of Letters Patent.

Patented Mar. 20, 1917.

Original application filed January 29, 1910, Serial No. 540,784. PatentNo. 1,101,917. Divided and this application filed June 2. 1914.

To all whom it may concern:

Be it known that I, DAVID B. F Lownn, citizen of the United States,residing at Glenside, in the county of Montgomery and State ofPennsylvania, have invented certain new and useful Improvements inBruslr Holders, of which the following is a specification, referencebeing had therein to the accompanying drawing.

This invention relates to brush holders for electrical machines such asdirect current motors and generators, and particularly to that typeemployed in connection with street railway service, the invention beinga division of an application filed by me under date of January 29, 1910,the same having issued as Patent No. 1101917, dated June 30, 1914.

The object of this invention is to provide a brush holder of simpleconstruction, very eliicient in point of service, and comprising a smallnumber of parts, which parts may be readily adjusted in proper relationone to the other for effectually performing the functions for which theyare intended. To this end the structure embodies a brush holder having aresilient member secured at one end to a stud rotatably mounted upon asuitable support, and adapted to bear with its other end upon the brush,said stud capable of being rotated within its bearings for adjusting thetension. of the resilient member, suitable improved means, which formthe principal feature of this invention, be-

" ing also provided for holding said stud in any of its adjustedpositions.

Further objects and advantages will appear in the following description,it being understood that various changes in form, proportions and minordetails of construction may be resorted to within the scope of theappended claims.

In the drawings Figure 1 is an end view of a portion of a motor havingbrush holders constructed according to my invention;

Fig. 2 is a perspective view of the brush holder detached from theelectric machine and showing the parts in assembled relation;

Fig. 8 is a vertical section of the same taken on the line 3-3 of Fig.2.

Referring to the drawings, it is to be noted that the brush holdercomprises a bracket 1 provided with a guideway 2 to re- Serial No.842,387.

ceive the brush 3, and also having bearings 4: and 5 to receive a stud(3. The stud 6 is recessed at a point indicated at 7 to receive and.support the resilient member 8, one end of which is forced into therecess as clearly shown in Fig. This resilient member 8 is coiled aboutthe stud l3 and bears with its free end against the brush 3, and in thisrelation, the tension of the resilient member may be varied to obtainany desired pressure against said brush, the same being accomplished bytightening the coiled part of said member by my improved adjusting meansto be hereinafter more fully set forth.

As has heretofore been mentioned, the resilient member 8 may be adjustedto vary the tension thereof and the consequent pressure of the brushagainst the commutator, and this adjustment is brought about by means ofthe rotatable stud 6, which as the same is rotated within its bearings &and 5 in one direction serves to tighten the coiled part of saidresilient member, and as will be obvious, allows said coiled part tounwind when the same is rotated in an oppo site direction. Passingthrough bearing t is a set-screw 10, which cooperates with the outersurface of the stud and serves to hold and retain the same in adjustedposition. Furthermore, the stud is transversely bored at the points 11and 12 for the purpose of receiving a rod or tool of any desireddescription, by means of which the stud may be rotated within saidbearings for adjusting the resilient member.

It will thus be seen that a very simple and eflicient means is providedfor adjusting the tension of the resilient member, and that a wide rangeof adjustment may be had. Furthermore, the parts may be easilydisconnected and assembled, which is a particular advantage in therenewing of worn out and broken parts.

Having thus described my invention, what I claim and desire to secure byLetters Patent is 1. In a brush holder, the combination of a support, astud rotatably mounted on said support, a resilient member secured atone end to the stud and adapted to bear with its other end upon a brush,means for rotating the stud for adjusting the tension of the re silientmember, and means carried by the support and adapted to cooperate withthe stud at any point around the periphery Cir thereof for holding saidstud in any desired position 01f adjustment.

2. In a brush holder, the combination of a support, a stud rotatable inbearings on said support, a resilient member detaehably secured at oneend to the stud and adapted to bear with its other end upon the brush,means for rotating the stud to adjust the tension of the resilientmember, and a set screw passing through the bearing for the stud andadapted to cooperate With the stud at any point around the peripherythereof for holding said stud in any desired position of adjustment.

3. In a brush holder, the combination of a support, a stud rotatablymounted in bearings on said support, a resilient member detachablysecured at one end to the stud and the periphery thereof for holding thestud in adjusted position.

In testimony whereof I have aifixed my signature in presence of tWoWitnesses.

DAVID B. FLOWER.

Witnesses HARRY RENMNGER, P1 111111 RENNINGER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

